Something I have noticed a lot more recently is whenever the show Seinfeld comes up on 90s Nostalgia pages and Twitter etc....there seems to be a split down the middle between people that think the show feels outdated now v.s. those that think it holds up pretty well.
I mean yeah there's no smartphones, social media, or Uber references etc but take away those aspects and the show still feels pretty solid to me. I think the humor and the storylines that revolve around dealing with random people or the nuances of dating and society in general are still pretty relevant.
There's other shows from back then I really liked...and still do...but do feel very outdated now. Something like Married with Children would be a good example of that for me.